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Oceniono. / 5. Na podstawie oceny klientów
To allow safe migration of virtual machines between hosts with different sets of CPU features, q emu -
kvm does not expose all features from the host CPU to guest operating systems by default. Instead,
CPU features are exposed based on the chosen CPU model. If a virtual machine has a given CPU
feature enabled, it is not possible to migrate it to a host that does not support exposing that feature to
guests.
Note
For more information on guest CPU models, refer to the Red Hat Enterprise Linux 6 Virtualization
Host Configuration and Guest Installation Guide.
4.5. St orage
Storage for virtual machines is abstracted from the physical storage used by the virtual machine. It is
attached to the virtual machine using the para-virtualized or emulated block device drivers.
4 .5.1. St orage pools
A storage pool is a file, directory, or storage device managed by lib virt for the purpose of providing
storage to virtual machines. Storage pools are divided into storage volumes that store virtual
machine images or are attached to virtual machines as additional storage. Multiple guests can share
the same storage pool, allowing for better allocation of storage resources. Refer to the Red Hat
Enterprise Linux 6 Virtualization Administration Guide for more information.
Lo cal st o rag e p o o ls
Local storage pools are directly attached to the host server. They include local directories,
directly attached disks, physical partitions, and LVM volume groups on local devices. Local
storage pools are useful for development, testing and small deployments that do not require
migration or large numbers of virtual machines. Local storage pools may not be suitable for
many production environments as they do not support live migration.
Net wo rked ( sh ared ) st o rag e p o o ls
Networked storage pools include storage devices shared over a network using standard
protocols. Networked storage is required when migrating virtual machines between hosts
with virt - man ag er, but is optional when migrating with vi rsh. Networked storage pools
are managed by lib virt .
4 .5.2. St orage volumes
Storage pools are further divided into storage volumes. Storage volumes are an abstraction of
physical partitions, LVM logical volumes, file-based disk images and other storage types handled by
lib virt . Storage volumes are presented to virtual machines as local storage devices regardless of the
underlying hardware.
4 .5.3. Emulat ed st orage devices
The host emulates a range of storage devices that can be presented to virtual machines. Each type of
storage device is appropriate for specific use cases. Choice between different types of storage
devices allows for maximum flexibility and compatibility with guest operating systems.
virt io - scsi
Red Hat Ent erprise Linux 6 Virt ualizat io n G et t ing St art ed G uide
24
- Red Hat Enterprise Linux 6 1
- Table of Contents 5
- 1. Document Convent ions 6
- 1.2. Pull-quot e Convent ions 7
- 2.2. We Need Feedback! 9
- Chapter 1. Introduction 10
- Chapt er 1 . Int roduct io n 11
- 2.2. Migrat ion 13
- 3.1. Virt ualizat ion cost s 16
- 3.3. Performance 16
- 3.4. Disast er recovery 17
- 3.5. Securit y 17
- Important 20
- 4.4. Guest CPU models 27
- 4.5. St orage 28
- 4 .5.4 . Host st orage 29
- 5.1. vi rsh 31
- 5.2. vi rt-manag er 31
- 5.3. vi rt-i nstal l 31
- 5.4. g uestfi sh 32
- 5.5. Ot her useful t ools 32
- Revision History 36
- Revision Hist ory 37
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